Improvement in plate-printing for colors



etnica sang @sind fuliiijir;

JOSEPH NTHOFFER, OF WASHINGTON, DISTRICT OF COLUMBIA.

Letters Patent No. 97,287, :lated November 30, 1869.`

IMPROVEMENT IN PLATE-PRINTIN G- FOR COLQRS.

'The Schedule referred to in these Letters Patent and making peut of thesame I Be it` known that I, J osnrrr EN'rnorrnn, of Washnigton, Districtof Columbia, have invented a new and improved Mode of Printing Chromosfrom metallic f piates ofthe plate-press; and'I do hereby declare thatthe following is a full andcxact description thereof', reference beinghad to the accompanying drawings,

and to the letters of reference marked thereon.V

The nature ot' my invention consists in a new mode of printing` chromosfrom metallic plates, by means of registers, andlmode of holding thepaper during the process of l printing.

To enable others skilled in the art to make and use my invention, I willproceed to describe its constructlon and operation with any kind of'copperplate presses. i

I construct my registers of any kind of metal, the

-best being of the Sallie kind as the engraved plates from which printsare to be taken.

Two registers are used, and both..must be of identical gauge andthickness as the plates in question. They represent parts of a frame,and may sometimes be used in form of a whole frame. The object of thisiste cause the successive plates to rest exactly on the same place asthe first.4

After each operation of printing, the paper is held by the margin,secure from casual change of position 'between the cylinder and theregister, until the reeffected by means of careful transfers of thedressing,

in the usual way of engraving on metallic plates. XVhat I claim as myinvention, and desire to secure by Letters Patent, is-

l. The mode of printing chrornos from engraved plates, by the use otgauges on the register A, substantially as set forth. 4

2. In combination with the above, the mode of holding the margin of thepaper during the process of changing the plates.

YJOSEPH ENTHOFFER.

Witnesses:

ADOLF GLUss, J. F. OLMsTEAn.

